Synchronized switch damping on inductor and negative capacitance

Abstract

This article presents a strategy for enhancing the performance of the synchronized switch damping on inductor technique used for the semiactive control of structural vibrations. This enhancement is achieved by adding a negative capacitance to the resonant circuit that dissipates the energy converted by a piezoelectric transducer embedded in the structure. A unidimensional spring-mass system shunted synchronously to a resonant circuit is studied analytically, and the main parameters governing the performances of the system are highlighted. Experimental results obtained with a synthetic negative capacitance demonstrate the enhancement of the performance of synchronized switch damping on inductor and confirm the parametric dependencies identified analytically.

An autonomous synchronized switch damping on inductance and negative capacitance for piezoelectric broadband vibration suppression

“…As explained earlier in Section 1, that by replacing an inductor in the SSDI by a negative capacitor, the voltage inversion is still possible with better control performance than SSDI [14]. However, the absence of inductor from the shunt circuit of SSDNC results in the generation of high current during the switching process which produces saturation of synthetic negative capacitor [17]. Thus in order to get a complete picture of our proposed autonomous SSDNCI technique, experiments will be performed on a cantilever aluminum beam by using autonomous SSDI, autonomous SSDNC and autonomous SSDNCI technique to demonstrate the better damping capabilities of the proposed autonomous SSDNCI technique as compared to previous autonomous SSD techniques.…”

“…During the switching action the negative capacitance in the shunt circuit increases artificially the electromechanical coupling factor [2,15,16] along with increased electric charge stored in the piezoelectric patch, thus leading to enhanced energy dissipation and damping performance as compared to SSDI [14]. However, the absence of inductor from the shunt circuit of SSDNC results in the generation of high current during the switching process which produces saturation of synthetic negative capacitor and limited damping performance [17]. Moreover, the use of negative capacitor, which is also an active element, can lead to stability issues [17].…”

“…This paper proposes a new autonomous SSD technique by utilizing a negative capacitance in the shunt circuit of SSDI which is called autonomous synchronized switch damping on negative capacitance and inductance (SSDNCI). Although, Mokrani et al [17] have already presented research work on SSD on inductor and negative capacitance comprehensively, however, this article is particularly focused on the autonomous implementation of their work. This technique consists of a shunt which is composed of two parallel branches connected to the piezoelectric transducer.…”

“…However, the absence of inductor from the shunt circuit of SSDNC results in the generation of high current during the switching process which produces saturation of synthetic negative capacitor and limited damping performance [17]. Moreover, the use of negative capacitor, which is also an active element, can lead to stability issues [17]. A comprehensive discussion on stability of negative capacitance is presented by Mokrani et al [17].…”

“…Moreover, the use of negative capacitor, which is also an active element, can lead to stability issues [17]. A comprehensive discussion on stability of negative capacitance is presented by Mokrani et al [17].…”